Safety-socket for taps or drills



No. 572,099. Patented Dec. 1,1896.

WITNESS-EB:

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we nonms Pmns co. morrurrno. wAsum UNITED STATES GOTTLIEB BETTCHER,

PATENT ()FFIcE.

OF CLEVELAND, OHIO SAFETY-SOCKET FOR TAPS OR DRILLS.

SPECIFICATION forming part of Letters Patent No. 572,099, dated December1, 1896.

Application filed June 5, 1896. Serial No. 594,451. (No model.)

Tn ct/Il whom it may concern.-

Be it known that I, GOTTLIEB BETTCHER, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented certain new and useful Improvements in Safety-Sockets for Tapsor Drills, of which the following is a full, clear, and exactdescription.

My invention relates to sockets for holding taps or drills in a lathe orother machine; and it consists of the several parts and combinations ofparts hereinafter fully described and especially claimed.

The object of myimprovement is to provide a socket or sockets of theclass designated above which prevent the breaking of taps and drills.Many taps and drills are twisted apart and rendered useless in theoperation of tapping and boring, but my invention overcomes this troubleand consequently saves much time, money, and vexation. The tools arequickly and easilyattached to or detached from the sockets,which arethemselves readily connected to the machine or disconnected therefrom.The peculiar construction of the tap-socket enables the tap to beautomatically detached from said socket when the string of nuts exceedsin length that ofsaid tap, as will be explained in full hereinafter. Afurther saving in expense results from the fact that a part of thesocket is universal, it being necessary to change only. the other partfor the accommodation of diiferent sizes of tool-heads, as will appearmore fully in the following description.

That my'invention may be seen and fully understood by others, referencewill be had to the following specification and annexed drawings, forminga part thereof, in which Figure 1 is a side view, inpartial section, ofthe tap-socket having a tap attached thereto; Fig. 2, a central verticalsection of said socket; Fig. 3, a view of the upper part of said tap;Fig. 4, a top view of said socket; Fig. 5, a bottom view of the same;Fig. 6, a side view, in partial section, of the drill-socket having adrill attached thereto; Fig. 7, a rear end view of said socket, and Fig.8 a front end view of the same.

Similar figures of reference designate like parts in the drawings andspecification.

Since there is some difference in construction between the socketemployed for holding taps and that used for drills, it will be necessaryto describe the two separately, and I will 5 5 begin with the tap-socketand tap illustrated in the first five figures of the accompanyingdrawings.

The tap-socket consists principally of the sleeve 1 and the holder 2.the flange 3 at its lower end and is provided with the screws 4 4, whichare located oppo-- site each other. above said flange. The ends of thescrews 4 project into the passage 5, which extends through the sleeve 1.or less than two screws 4 may be employed, if desired. The holder 2 hasthe spindle 6, in the periphery of which is the annular groove 7. Thespindle 6 is inserted in the passage 5 and the holder 2 is revolubl yheld against-the base of the'sleeve lby the screws 4, which enter thegroove 7. The rectangular passage 8 appears in the center of the holder2 and opens into I the annular passage 9 in the spindle 6.

Four steel bushings 10 are set into the flange 3 and have therein theholes 11, 12, 13, and 14, each smaller than the preceding, beginningwith 11. set into the holder 2, in which are the holes 11 of the samesize as the largest hole in the flange 3. The centers of all of theholes just described are equidistant from the center of the sleeve 1. 1are two holes 15 to receive an instrument for driving saidsleeve off ofthe power-spindle of the lathe or other machine.

At right angles to the axis of the holder 2 is the passage 16, extendingfrom the periphery'of said holder to the passage 8. The inner terminalof the passage 16 is constricted and the spiral spring 19 is interposedbetween 5 said screw and the head of the pin 17, thereby normallyforcing said pin inward with its end extending into the passage 8, asabove stated. The tap 20 has the rectangular head 21, in which are oneor more depressions 22, I00

arranged to register with the pin 17 when said tap is attached to thesocket. The head 21 of the tap 2Ov is a little smaller than the passage8, into which it is inserted and forced by The sleeve 1 has 60 More 65Two steel bushings 10arc In the upper end of the sleeve the pin 17 asfar as the shoulder formed by said head and the shank of said tap willpermit, when said pin enters the corresponding depression 22 andprevents the tap from falling out of the socket. The passage 3 may havemore or less than four sides provided it conforms to the tap-head.

The pin 23 passes through the hole 13 in the flange 3 and thecorresponding hole 11 in the holder 2 and prevents the turning of oneupon the other. Now when motion is imparted to the sleeve 1 the holder 2and tap 20 are revolved with said sleeve unless a tough place isencountered in the metal in which said tap is working, when said pinbreaks instead of the tap and the sleeve continues to revolve withoutthe holder and tap. The sleeve is then stopped, a new pin inserted inplace of the broken one, the tap-withdrawn from the metal in which itwould have otherwise been twisted asunder, and operation resumed. Thepins vary in size to fit the holes in the flange 3, thus providing fordifferent strengths to match the different sizes of taps, and the twoholes in the holder 2 allow a pair of pins to be used, if necessary, butordinarily one is suflicient. The pin selected for use with a given sizeof tap must be of a size which has been found to break under a littleless strain than is necessary to break the tap.

When tapping nuts and the tap 20 becomes full, the downward pressure ofthe nuts will draw the tap out of the holder 2 instead of breaking saidtap, as often happens when it is attached to the ordinary chuck. The tap20 is forcibly withdrawn by hand from the holder 2 in a similar mannerto that in which itis inserted therein.

The drill-socket shown in Figs. 6, '7, and 8 consists principally of thesleeve 1 and the holder 2. The sleeve 1 has the tapering spindle 2% atthe rear end for insertion in a chuck on a lathe or other machine andthe flange 3 at the front terminal. The holder 2 is provided with thespindle 6, which enters a suitable passage in the sleeve 1, said spindlehaving the annular groove 7. The holder 2 is revolubly attached to thesleeve 1 by the screws 4 4:, threaded to openings in said sleeve andentering the groove 7. Both the flange 3 of the sleeve 1 and the holder2 are provided with the steel bushings 10, in which are the holes 11,12, 13, and 14, as in the tap-sleeve flange and holder. The taperingpassage 25 appears in the center of the holder 2 to receive the taperingshank of the drill 26, and the inner end of said passage is contractedto hold the flattened head of said drill and prevent the tool fromturning in said holder. The transverse slot 27 is made in the sleeve 1for inserting an instrument to drive out the drill 26. The pin 23 servesthe same purpose in connecting the drill-socket holder 2 to the flange 3as the pin 23 in the tap-socket.

Since the drill 26 is operated in a horizontal position, it is necessaryto have the springclasps 28, corresponding in number to the holes in theflange 3 of the sleeve 1, attached to said flange for holding the pinsin place. The clasp 28 adjacent to the pin 23 is turned over the head ofsaid pin and prevents it from working out. operated horizontally, itshould be equipped with the clasps 28, and said clasps may be omittedfrom the drill-socket if the latter is intended for vertical use only.

The different sizes of tap-heads require as many holders 2, constructedwith passages adapted to accommodate said heads, but only one sleeve 1is necessary to receive the various holders, and the same is true inregard to the drill-heads, holders 2, and sleeve 1. By turning thescrews 4 in the sleeve 1 (or 1) until their ends clear the groove 7 theholder 2 (or 2) may be detached from said sleeve to be replaced byanother, after which said screws are reseated.

It is obvious that the same means of attaching the drill to the socketmay be employed as that for the tap by constructing the drill with anangular head, and by mak ing the tap-head like the present drill-headthe tap could be used in the drill-socket, but the forms shown andpreviously described are considered to be the better.

lVhat I claim as my invention, and desire to secure by Let-ters Patent,is

In a safety-socket for taps and drills, the following elements incombination; a sleeve 1 provided with an annular flange 3 at one Thenthe tap-socket is,

end, a tool-holder 2 provided with the spindle 6 rotatable within saidsleeve 1, an annular groove 7 in the periphery of said spindle, screws4: engaging said sleeve and spindle, a series of holes 11, 12, 13, and14 in the

